JavaScript access to the versionHistory property?

martin_cowie — Tue, 13 May 2008 13:36:11 GMT

I'm trying in vain to find a means of examining the version history of a document, using the Javascript API. All I need is the number versions, and the size of each version.The documentation suggests that FreeMarker can access a nodes 'versionHistory' node, but the JavaScript certainly cannot.I'm in

Re: JavaScript access to the versionHistory property?

martin_cowie — Wed, 14 May 2008 15:26:55 GMT

Found it! The solution was use the power of the Rhino Javascript engine to access bits of its Java environment.

The ScriptNode object has a protected 'services' field. Once that can be accessed, everything else falls into place …

var PROP_CONTENT = Packages.org.alfresco.model.ContentModel.PROP_CONTENT;
var versionService = null;
var nodeService = null;

function getServices( doc )
{
   // *BEWARE* - HERE BE DRAGONS
   var servicesField = doc.getClass().getDeclaredField( "services" );
   servicesField.setAccessible( true ); // ick - yuck - nasty - but necessary
   var serviceRegistry = servicesField.get( doc );

   versionService = serviceRegistry.getVersionService();
   nodeService = serviceRegistry.getNodeService();
}

function getHistory( doc )
{
   return versionService.getVersionHistory( doc.nodeRef ).getAllVersions().toArray();
}

function getVersionSize( version )
{
   return nodeService.getProperty( version.getFrozenStateNodeRef(), PROP_CONTENT ).getSize();
}
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Once getServices() is called with a ScriptNode object, we can then call getHistory() to get a Java array of Version objects. Given a Version object, getVersionSize() can be called to get the size of its content.

It's a bit ugly, but a worthy demonstration of Rhinos power.

M.

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JavaScript access to the versionHistory property?

Re: JavaScript access to the versionHistory property?